Lua: all steps and self-hosting.

Also some misc docs/TODO updates.

1 files changed, 55 insertions, 0 deletions

diff --git a/lua/printer.lua b/lua/printer.lua
new file mode 100644
index 0000000..8c1cdad
--- /dev/null
+++ b/lua/printer.lua
@@ -0,0 +1,55 @@
+local string = require('string')
+local table = require('table')
+local types = require('types')
+local utils = require('utils')
+
+local M = {}
+
+function M._pr_str(obj, print_readably)
+    local _r = print_readably
+    if utils.instanceOf(obj, types.Symbol) then
+        return obj.val
+    elseif types._list_Q(obj) then
+        return "(" .. table.concat(utils.map(function(e)
+            return M._pr_str(e,_r) end, obj), " ") .. ")"
+    elseif types._vector_Q(obj) then
+        return "[" .. table.concat(utils.map(function(e)
+            return M._pr_str(e,_r) end, obj), " ") .. "]"
+    elseif types._hash_map_Q(obj) then
+        local res = {}
+        for k,v in pairs(obj) do
+            res[#res+1] = M._pr_str(k, _r)
+            res[#res+1] = M._pr_str(v, _r)
+        end
+        return "{".. table.concat(res, " ").."}"
+    elseif type(obj) == 'string' then
+        if string.sub(obj,1,1) == "\177" then
+            return ':' .. string.sub(obj,2)
+        else
+            if _r then
+                local sval = obj:gsub('\\', '\\\\')
+                sval = sval:gsub('"', '\\"')
+                sval = sval:gsub('\n', '\\n')
+                return '"' .. sval .. '"'
+            else
+                return obj
+            end
+        end
+    elseif obj == types.Nil then
+        return "nil"
+    elseif obj == true then
+        return "true"
+    elseif obj == false then
+        return "false"
+    elseif types._malfunc_Q(obj) then
+        return "(fn* "..M._pr_str(obj.params).." "..M._pr_str(obj.ast)..")"
+    elseif types._atom_Q(obj) then
+        return "(atom "..M._pr_str(obj.val)..")"
+    elseif type(obj) == 'function' then
+        return "#<function>"
+    else
+        return string.format("%s", obj)
+    end
+end
+
+return M